Reference for Sanhedrin 63:11

<big><strong>גמ׳</strong></big> דיני ממונות מי בעינן דרישה וחקירה ורמינהו שטר שזמנו כתוב באחד בניסן בשמיטה ובאו עדים ואמרו היאך אתם מעידין על שטר זה והלא ביום פלוני עמנו הייתם במקום פלוני שטר כשר ועדיו כשרין חיישינן שמא איחרוהו וכתבוהו

of indebtedness are invalid;<span class="x" onmousemove="('comment',' As a rule the debtor's property is given as security for the loan, and in the case of default, the creditor may seize it if sold after the loan was incurred, but not before. Hence, if the note was ante-dated, sold property might be seized unlawfully. In order to prevent this, an ante-dated bond was declared altogether invalid, even from the date of transaction. Cf. B.M. 72a. ');">²⁰</span> if post-dated, they are valid.<span class="x" onmousemove="('comment',' It appears that the creditor must have renounced his security for the period between the date of the loan and that appearing on the note. ');">²¹</span>

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